138643377 has 8 divisors (see below), whose sum is σ = 190821120. Its totient is φ = 89447280.

The previous prime is 138643369. The next prime is 138643397. The reversal of 138643377 is 773346831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 138643377 - 2³ = 138643369 is a prime.

It is not an unprimeable number, because it can be changed into a prime (138643327) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 745302 + ... + 745487.

It is an arithmetic number, because the mean of its divisors is an integer number (23852640).

Almost surely, 2^138643377 is an apocalyptic number.

It is an amenable number.

138643377 is a deficient number, since it is larger than the sum of its proper divisors (52177743).

138643377 is a wasteful number, since it uses less digits than its factorization.

138643377 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1490823.

The product of its digits is 254016, while the sum is 42.

The square root of 138643377 is about 11774.6922252771. The cubic root of 138643377 is about 517.5667593400.

The spelling of 138643377 in words is "one hundred thirty-eight million, six hundred forty-three thousand, three hundred seventy-seven".